Zero-tolerance policing

Zero-tolerance policing (ZTP) is a strategy that aims to reduce minor offences and more serious crime through relentless order maintenance and aggressive law enforcement, against even minor disorder and incivilities (Dur and Van Der Weele, 2013). A systematic review of the evidence has, however, shown that aggressive order maintenance has not reduced crime, and concluded that ZTP is not an effective crime reduction strategy (Braga and others, 2019). The review found that policing disorder can reduce crime, but only when community policing and problem-solving were used.

ZTP is most commonly associated with New York Police Department (NYPD) during the 1990s, a period when crime fell dramatically in New York City (Zimring, 2011). It does not necessarily follow that ZTP caused crime to fall.

A wide range of alternative explanations have been put forward for the New York crime drop. These include population changes, stabilisation of drug markets, increased rates of imprisonment and changes to abortion laws (eg, Bowling, 1999; Kelling and Sousa, 2001; Kim and others, 2015; Roeder and others, 2015; Wendel and others, 2016a; b; Donoghue and Levitt, 2001). Changes to policing may have also made an important contribution (Zimring, 2011).

Bill Bratton, chief of the NYPD at the time,  said he finds ZTP a 'troublesome' term and one that does not 'capture the meaning of what happened in New York City' (1998: 42-43). While recognising the language of ZTP can send out a powerful rhetorical message, Bratton has said it oversimplifies the complexity of policing and suggests an overzealous approach.

Advocates of order maintenance policing have also observed that NYPD officers simply started paying attention to offences that had previously been ignored, and only sometimes took formal action (Sousa and Kelling, 2006). There is a risk that law enforcement without targeting could be counter-productive in the longer term if it is perceived to be unfair and undermines the legitimacy of the police (Weisburd, Telep and Braga, 2010; Greene, 2014) (see What stops people offending).

Bratton described the NYPD approach during the 1990s as 'better, smarter, and more assertive policing in partnership with the criminal justice system and the community we serve – community policing' (1998: 40). He mentioned an overall increase in officer resources as a springboard, although the evidence on police numbers suggests targeting of resources is most important (see The impact of police numbers on crime rates). This finding is reflected in the elements of NYPD reform highlighted by Bratton:

  • The setting of clear organisational goals to reduce crime, disorder and fear.

  • The development of concrete plans for crime reduction.

  • Organisational decentralisation, which pushed responsibility and accountability to a local level.

  • A focus on quality of life issues, as well as serious crime.

  • The targeting of crime hot spots and the use of problem-solving (see Targeted approaches to crime and disorder reduction).

  • The introduction of regular CompStat performance meetings (see CompStat).


Broken windows

'Broken windows theory' is often mentioned in connection with ZTP (Kelling and Wilson, 1982). Bottoms (2012) and Welsh and others (2015) provide overviews of the literature on broken windows. Briefly, this theory suggests that low-level disorder must be tackled quickly ('mending the broken windows') or else the problems in the area will quickly escalate. Serious offenders from elsewhere, sensing an opportunity, will move in, while residents become increasingly worried about crime.

While there is evidence that low-level disorder, if not addressed, can lead to other disorders and crimes, research has failed to find convincing evidence of the long-term sequence of events originally put forward in the broken windows theory [1]. There are probably two reasons:

  • The evidence suggests that serious offenders have other priorities when deciding where they should operate.

  • The assumed sequence of events did not take account of the potential for a local response to what was happening. In many areas, residents become concerned and often call on authorities to become more visible (see The effectiveness of visible police patrol).



Baumer EP and Wolff KT. (2014). 'Evaluating Contemporary Crime Drop(s) in America, New York City, and Many Other Places'. Justice Quarterly, 31(1), pp 5-38.

Bottoms A. (2012). 'Developing Socio-Spatial Criminology'. In: Maguire M, Morgan R and Reiner R, eds. 'The Oxford Handbook of Criminology' (fifth edition). Oxford: Oxford University Press.

Bowling B. (1999). 'The Rise and Fall of New York Murder: Zero Tolerance or Crack's Decline?' British Journal of Criminology, 39(4), pp 531-554.

Braga AA, Welsh BC and Schnell C. (2019). 'Disorder policing to reduce crime: a systematic review'. Campbell Systematic Reviews.

Bratton W. (1998). 'Crime is Down in New York City: Blame the Police'. In: Dennis N, ed. 'Zero tolerance: Policing a Free Society'. London: Institute of Economic Affairs.

Donohue JJ and Levitt SD. (2001) 'The Impact of Legalized Abortion on Crime'. The Quarterly Journal of Economics, 116(2), pp 379-420.

Dur R and Van Der Weele J. (2013). 'Status‐Seeking in Criminal Subcultures and the Double Dividend of Zero‐Tolerance'. Journal of Public Economic Theory, 15(1), pp 77-93.

Greene JR. (2014). 'Zero Tolerance Policing'. In: Reisig MD and Kane RJ, eds. 'The Oxford Handbook of Police and Policing', pp 172-196.

Hinkle JC. (2013). 'The relationship between disorder, perceived risk, and collective efficacy: a look into the indirect pathways of the broken windows thesis'. Criminal Justice Studies, 26(4), pp 408-432.

Kelling G and Sousa W. (2001). 'Do Police Matter? An Analysis of the Impact of New York City's Police Reforms'. New York: Manhattan Institute for Policy Research.

Kelling G and Wilson J. (1982). 'Broken Windows: The Police and Neighborhood Safety'. The Atlantic Magazine, March 1982.

Kim J, Bushway S and Tsao HS. (2015). 'Identifying Classes of Explanations for Crime Drop: Period and Cohort Effects for New York State'. Journal of Quantitative Criminology, 32, pp 357-375.

Mazerolle L, Soole D and Rombouts S. (2007). 'Disrupting Street-Level Drug Markets'. Washington DC: US Department of Justice Office of Community Oriented Policing Services.

Roeder O, Eisen L-B and Bowling J. (2015). 'What Caused the Crime Decline?' New York: Brennan Center for Justice, NYU Law School.

Sousa W and Kelling G. (2006). 'Of "Broken Windows", Criminology and Criminal Justice'. In: Weisburd D and Braga A, eds. 'Police Innovation: Contrasting Perspectives'. Cambridge: Cambridge University Press.

Weisburd D and others. (2015). 'Understanding the Mechanisms Underlying Broken Windows Policing: The Need for Evaluation Evidence'. Journal of Research in Crime and Delinquency, 52(4), pp 589-608.

Weisburd D, Telep C and Braga A. (2010). 'The Importance of Police in Policing: Empirical Evidence and Policy Recommendations'. Swedish National Council for Crime Prevention. Stockholm: The Swedish National Council for Crime Prevention.

Weisburd D and others. (2015). 'Do stop, question, and frisk practices deter crime? Evidence at microunits of space and time'. Criminology and Public Policy, 15(1), pp 31-56.

Welsh BC, Braga AA and Bruinsma GJN. (2015). 'Reimagining Broken Windows: From Theory to Policy'. Journal of Research in Crime and Delinquency, 52(4), pp 447-463.

Wendel T. (2016a). '"More drugs, less crime''': why crime dropped in New York City, 1985-2007'. Dialect Anthropol, 40, pp 319-339.

Wendel T. (2016b). 'Cheaper Drugs and thus less crime: the crime drop's "Philosophers Stone"?' Dialect Anthropol, 40, pp 385-393.

Xie M. (2014). 'Area Differences and Time Trends in Crime Reporting: Comparing New York with Other Metropolitan Areas'. Justice Quarterly, 31(1), pp 79-109.

Zimring F. (2011). 'The City that Became Safe: New York's Lessons for Urban Crime and Its Control'. Oxford: Oxford University Press.

[1] For example, the relationship between disorder, fear and collective efficacy has been questioned (Weisburd et al. 2015) or may follow an indirect pathway whereby mediating factors should be considered (Hinkle 2013).

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